. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 322 J. E. PURCELL. FIGURE 5. Suborder Cystonectae. A. Portion of unbranched tentacle of P/n'.W/fl (Fam. Physalidae), 50x, scale = 200 ^m. B. Nematocysts of P. physalis in cells with fibrillar attachments to the tentacles, 400X, scale = 10 ^m. C. Nematocyst thread of P. physalis, 8000X, scale = 1 ^m. D. Nematocyst of Rhizophysa eysenhardti (Fam. Rhizophysidae) penetrating under the scales of a fish larva, lOOOx, scale = 10 nm. E. Branched tentacle of Rhizophysa eysenhardti, 100X, scale - 100 ^m. F. Tentacle tip of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 322 J. E. PURCELL. FIGURE 5. Suborder Cystonectae. A. Portion of unbranched tentacle of P/n'.W/fl (Fam. Physalidae), 50x, scale = 200 ^m. B. Nematocysts of P. physalis in cells with fibrillar attachments to the tentacles, 400X, scale = 10 ^m. C. Nematocyst thread of P. physalis, 8000X, scale = 1 ^m. D. Nematocyst of Rhizophysa eysenhardti (Fam. Rhizophysidae) penetrating under the scales of a fish larva, lOOOx, scale = 10 nm. E. Branched tentacle of Rhizophysa eysenhardti, 100X, scale - 100 ^m. F. Tentacle tip of R. filiformis, 100X, scale = 100 ^m. G. Nematocysts of R. filiformis, 400X, scale = 10 ^m. H. Discharged nematocyst of R. eysenhardti, 1000X, scale = 10 nm. I. Appendage with a red spot (rs) from the tentacles of R. filiformis, 25X, scale = 200 ^m. and Hessinger, 1980) and R. filiformis, and apparently atrichous threads in R. filiformis and R. eysenhardti (Fig. 5H). The spines on the nematocyst threads of P. physalis are too small to be discerned with certainty by light microscopy; therefore the ne- matocysts were thought to be atrichous isorhizas [Weill, 1934, Physalia arethusa (= physalis), 15-42 ^m diameter; Totton, 1960; also measured by Lane and Dodge, 1958 ( X urn and X urn)]. The nematocysts of cystonects are much less diverse than those of calycophorans and physonects, and lack the conspicuous spination on the threads. The nematocysts are similar in size among cystonect species (Table III), and there is little diversity apparent in diet. Physalia physalis consumes fish larvae, small cephalopods, large chaetognaths, and leptocephallus larvae of eels (Purcell, submitted), as well as some larger fish to 10 cm in length (, Wilson, 1947); the other species consume fish larvae (Purcell, 198la, c). Those data show that cystonect siphonophores consume. Please note that these images are extracted from scanned page images that may have been digitally enhan
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
